Monolithic Power Systems Inc. MP2619EV-LF-P

Overview

MP2619EV-LF-P from Monolithic Power Systems is a monolithic 2–3 cell Li-ion battery switching charger IC with integrated 0.2Ω power MOSFET, 2A programmable charge current, ±0.75% battery voltage regulation accuracy, and system power path management. It operates from 5.5V to 24V input, delivers up to 90% efficiency at 2A, and supports automatic current sharing between charging and system load in portable netbooks and distributed power systems.

For engineers reviewing the MP2619EV-LF-P datasheet, MP2619EV-LF-P pinout, MP2619EV-LF-P application, or MP2619EV-LF-P equivalent, key selection considerations include its fixed 600kHz switching frequency, dual-loop CC/CV control architecture, NTC-based thermal monitoring, programmable charge timer, and QFN-28 (4mm × 5mm) package with exposed thermal pad.

Technical Context

The MP2619EV-LF-P implements peak current-mode control with dual compensation networks (COMPI for current loop, COMPV for voltage loop), enabling fast transient response and stable regulation across 2-cell (7.4V nominal) and 3-cell (11.1V nominal) Li-ion configurations. Its internal 3.3V LDO (VREF33) powers external circuitry up to 30mA and biases the NTC comparator.

Power path management uses OUT1 feedback to dynamically reduce charge current as system load increases-maintaining priority for VSYS supply while limiting total input current via RG1/RG2 gain configuration. Fault handling includes cycle-by-cycle overcurrent protection, thermal shutdown at 150°C, and battery temperature window monitoring using an external NTC thermistor divider.

Key Specifications

Pinout & Package

The MP2619EV-LF-P is housed in a thermally enhanced 28-pin QFN package (4mm × 5mm, 0.5mm pitch) with an exposed thermal pad. Pin 11 and Pin 21 are GND connections; the exposed pad must be soldered to a PCB ground plane for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion switching charger applications.

Compared with BQ24725ARHBT and ISL9238HRZ-T, the MP2619EV-LF-P offers superior integration for cost-sensitive portable electronics-delivering full power path arbitration, NTC hardware monitoring, and 2A charging in a single QFN without external switches or digital interfaces.

Availability

MP2619EV-LF-P is available at Aetrix Electronics and suitable for netbook PC power management, distributed power system chargers, and medical portable monitor battery packs requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP2619EV-LF-P includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with over 20 years of expertise in DC/DC conversion, battery management, and motor control solutions.

The MP2619 belongs to MPS's battery charger product line, engineered specifically for space-constrained portable devices requiring high-efficiency, thermally robust, and safety-certifiable Li-ion charging with autonomous power path management.

FAQ

What is the minimum input voltage required to initiate charging on MP2619EV-LF-P?

The MP2619EV-LF-P requires VIN ≥ 5.5V to exit under-voltage lockout (UVLO). The rising UVLO threshold is 3.2V typical, with 200mV hysteresis. Below 5.5V, the device remains in shutdown and draws only 0.5mA supply current. Input must also exceed battery voltage by at least 180mV for reverse-blocking diode operation.

How does the MP2619EV-LF-P implement power path current sharing between charging and system load?

It uses OUT1 feedback to monitor system current via RG1/RG2 gain network. When system load increases, OUT1 voltage rises, causing the COMPI loop to reduce charge current proportionally-ensuring VSYS remains powered first. Charge current drops linearly until reaching zero, after which only adapter current limits total system draw.

Can MP2619EV-LF-P safely charge a fully depleted 2-cell Li-ion battery?

Yes. It initiates trickle charge at 10% of programmed I_CC (e.g., 200mA for 2A setting) until battery voltage reaches 3.0V/cell. If voltage fails to rise within 30 minutes (set by TMR capacitor), charging terminates. This prevents lithium plating and thermal runaway in deeply discharged cells.

What is the function of the CELLS pin, and how should it be configured for 2-cell versus 3-cell operation?

The CELLS pin selects battery configuration: grounded for 2-cell (8.4V float), floating or tied to VREF33 for 3-cell (12.6V float). Internal trimming adjusts voltage reference scaling and current limit thresholds accordingly. Incorrect configuration causes inaccurate CV regulation and potential overvoltage.

Does MP2619EV-LF-P support automatic recharge after battery self-discharge?

Yes. After full charge, it enters low-power monitoring mode. If battery voltage falls below 4.0V/cell (with 100mV hysteresis), it restarts charging with soft-start and resets the TMR timer-preventing premature termination due to self-discharge during storage.

What thermal derating applies to MP2619EV-LF-P at elevated ambient temperatures?

With θ_JA = 40°C/W on a 4-layer PCB, maximum continuous power dissipation drops linearly: at 85°C ambient, PD_MAX = (150°C − 85°C)/40°C/W = 1.625W. At this point, 2A charging may require reduced duty cycle or forced airflow to avoid thermal shutdown.

Is the VREF33 output capable of powering external circuitry, and what are its limitations?

Yes-VREF33 provides a stable 3.3V ±30mV output with up to 30mA load capability. It must be bypassed with a 1µF ceramic capacitor to GND. Exceeding 30mA causes output droop and may destabilize NTC monitoring; use only for biasing thermistors or low-power comparators.